Golf L4-2.0L (AEG) (1999)
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readiness code again. See: Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
If oxygen sensor heater has continuity
Checking voltage supply
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Set multimeter to "Voltage measurement" range.
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Connect multimeter using aux. cables from VW1594 to measure voltage at terminals 1 and 2 (harness connector to Engine Control Module
(ECM).
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Start engine and run at idle
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Measure voltage supply and observe display group 41, display field 4.
Display: Htg.aC.ON
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Specified value: 11.0-14.5 V
Display: Htg.aC.ON/Htg.aC.OFF (alternating)
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Specified value: Between 0.0-12.0 V fluctuating
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Turn off ignition.
If no voltage is present:
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Remove wiper arms and plenum chamber cover.
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Connect VAG1598/22 test box to control module wiring harness.
